Pair of motor brushes for current 1/6 HP M.SR, M.SRM, and M.SRB reversing motors. Also for current M.SRH, M.SRMH and M.SRBH heavy duty reversing motors (115 volt and 230 volt). This is the current motor that has been in production since Nov. 2005. Earlier models of Series SR motors are 1/8HP and use different brushes (MP2019P). Brushes should be checked for wear periodically. When new they are approximately 5/8" long. Replace them when they have worn to 1/4". Be sure to replace both motor brushes even if one of them is less worn than the other.